Weird watery pink?

Hi! So I’ve been on the pill for over a year. My withdrawal bleeds coming on my week off. Before this withdrawal bleed I had brown discharge, saw a dr- negative pregnancy test and she said I was most likely stressed and to see if my period came. It came and was perfectly normal, regular flow and length and clotting. I’m on the last day of bleeding now so I am having my usual browny coloured blood, however when I pee and wipe there’s vey watery pink on the tissue paper? Is this just my wee mixing with anything that’s left? I don’t think it’s happened before but I could be wrong I have an awful memory😂 but obviously with what’s happened before my period I’m a bit like ???